From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eric Abrahamsen <eric@ericabrahamsen.net>
Cc: larsi@gnus.org, 38252@debbugs.gnu.org
Subject: bug#38252: 27.0.50; Gnus server definitions and generic function specializers
Date: Sun, 17 Nov 2019 21:03:00 -0500 [thread overview]
Message-ID: <jwv1ru69cc0.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <877e3yb0em.fsf@ericabrahamsen.net> (Eric Abrahamsen's message of "Sun, 17 Nov 2019 14:31:13 -0800")
> I'm ccing you directly because I suspect you're the only one who knows
> the answers to my questions :)
I doubt it, there's a lot of people around here more familiar with
CLOS-style programming than I.
> --8<---------------cut here---------------start------------->8---
> gnus-int.el:
> (cl-defgeneric gnus-request-list (server)
> "Docs and stuff.")
>
> (cl-defmethod gnus-request-list ((server gnus-server-legacy))
> (funcall (gnus-get-function server 'request-list)
> (nth 1 server)))
Why not just:
(cl-defmethod gnus-request-list (server)
(funcall (gnus-get-function server 'request-list)
(nth 1 server)))
which means "use it as a fallback". The downside is that it will be
used for non-legacy servers if there is no specific implementation for
that server, but presumably you can detect it and signal an appropriate
error somewhere inside gnus-get-function.
> What I'm trying to do is fairly simple: if the argument is a list, and
> the head of the list is a symbol that can be assoc'd into
> `nnoo-definition-alist', and the second element is a string, then it's a
> gnus-legacy-server.
Why not just use a `cons` specializer?
IIUC all the non-legacy servers will use structs, so you don't need to
use a specializer that's so specific that it has to check "if the
argument is a list, and the head of the list is a symbol that can be
assoc'd into `nnoo-definition-alist', and the second element is
a string".
Stefan
next prev parent reply other threads:[~2019-11-18 2:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-17 22:31 bug#38252: 27.0.50; Gnus server definitions and generic function specializers Eric Abrahamsen
2019-11-18 2:03 ` Stefan Monnier [this message]
2019-11-18 3:18 ` Eric Abrahamsen
2019-11-18 4:36 ` Stefan Monnier
2019-11-18 20:43 ` Eric Abrahamsen
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